Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first embodiment of a display screen orportion thereof with transitional graphical user interface showing afirst image in a sequence, showing our new design;

FIG. 2 is a front view showing a second image thereof;

FIG. 3 is a front view showing a third image thereof;

FIG. 4 is a front view showing a fourth image thereof;

FIG. 5 is a front view of a second embodiment of a display screen orportion thereof with transitional graphical user interface showing afirst image in a sequence;

FIG. 6 is a front view showing a second image thereof;

FIG. 7 is a front view showing a third image thereof;

FIG. 8 is a front view showing a fourth image thereof;

FIG. 9 is a third embodiment of a display screen or portion thereof withtransitional graphical user interface showing a first image in asequence;

FIG. 10 is a front view showing a second image thereof;

FIG. 11 is a front view showing a third image thereof;

FIG. 12 is a front view showing a fourth image thereof;

FIG. 13 is a fourth embodiment of a display screen or portion thereofwith transitional graphical user interface showing a first image in asequence;

FIG. 14 is a front view showing a second image thereof;

FIG. 15 is a front view showing a third image thereof;

FIG. 16 is a front view showing a fourth image thereof;

FIG. 17 is a front view of a fifth embodiment of a display screen orportion thereof with transitional graphical user interface showing afirst image in a sequence;

FIG. 18 is a front view showing a second image thereof;

FIG. 19 is a front view showing a third image thereof;

FIG. 20 is a front view showing a fourth image thereof;

FIG. 21 is front view of a sixth embodiment of a display screen orportion thereof with transitional graphical user interface showing afirst image in a sequence;

FIG. 22 is a front view showing a second image thereof;

FIG. 23 is a front view showing a third image thereof;

FIG. 24 is a front view showing a fourth image thereof;

FIG. 25 is a front view of a seventh embodiment of a display screen orportion thereof with transitional graphical user interface showing afirst image in a sequence;

FIG. 26 is a front view showing a second image thereof;

FIG. 27 is a front view showing a third image thereof;

FIG. 28 is a front view showing a fourth image thereof;

FIG. 29 is a front view of an eighth embodiment of a display screen orportion thereof with transitional graphical user interface showing afirst image in a sequence;

FIG. 30 is a front view showing a second image thereof;

FIG. 31 is a front view showing a third image thereof; and,

FIG. 32 is a front view showing a fourth image thereof.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-4, 5-8, 9-12, 13-16, 17-20, 21-24,25-28 and FIGS. 29-32. The process or period in which one imagetransitions to another image forms no part of the claimed design.

The outer broken lines in the figures illustrate a display screen orportion thereof and form no part of the claimed design. The remainder ofthe broken lines in the figures illustrate portions of the graphicaluser interface that form no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.